Set-top box



FIG. 1 is a perspective view of a set-top box showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof, the broken line showing are for illustrative purposes only and form no part of the claimed design;

FIG. 4 is a left side elevational view thereof, the broken line showing are for illustrative purposes only and form no part of the claimed design;

FIG. 5 is a right side elevational view thereof, the broken line showing are for illustrative purposes only and form no part of the claimed design;

FIG. 6 is a top plan view thereof, the broken line showing are for illustrative purposes only and form no part of the claimed design; and,

FIG. 7 is a bottom plan view thereof, the broken line showing are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a set-top box, as shown and described. 